<template>
    <div class="chart-trend">
        {{ term }}
        <span>{{ rate }}%</span>
        <span :class="['trend-icon', trend]"><a-icon :type="'caret-' + trend"/></span>
    </div>
</template>

<script>
export default {
  name: "Trend",
  props: {
    // 同title
    term: {
      type: String,
      default: '',
      required: true
    },
    // 百分比
    percentage: {
      type: Number,
      default: null
    },
    type: {
      type: Boolean,
      default: null
    },
    target: {
      type: Number,
      default: 0
    },
    value: {
      type: Number,
      default: 0
    },
    fixed: {
      type: Number,
      default: 2
    }
  },
  data () {
    return {
      trend: this.type && 'up' || 'down',
      rate: this.percentage
    }
  },
  created () {
    let type = this.type === null ? this.value >= this.target : this.type
    this.trend = type ? 'up' : 'down';
    this.rate = (this.percentage === null ? Math.abs(this.value - this.target) * 100 / this.target : this.percentage).toFixed(this.fixed)
  }
}
</script>

<style lang="less" scoped>
    .chart-trend {
        display: inline-block;
        font-size: 14px;
        line-height: 22px;

        .trend-icon {
            font-size: 12px;

            &.up, &.down {
                margin-left: 4px;
                position: relative;
                top: 1px;

                i {
                    font-size: 12px;
                    transform: scale(.83);
                }
            }

            &.up {
                color: #f5222d;
            }
            &.down {
                color: #52c41a;
                top: -1px;
            }
        }
    }
</style>
